TW202413880A - Position detection device - Google Patents

Abstract

The present invention provides a position detection device, which includes a base plate, a support member, a trigger member, a trigger member and a distance sensor member. The support member is movably arranged on the base plate. The trigger member is connected to the support member. The sensing member is arranged on the trigger member. The distance sensor member is arranged on the base plate. The sensing member and the distance sensor member are arranged so that when the support member drives the sensing member to move, the distance sensor member can detect the moving distance of the sensing member, and the trigger member is arranged to bypass the distance sensor member. The position detection device of the present invention has a high detection accuracy of the relative movement of the sensing member and the distance sensor member.

Description

Position detection device

This case involves the field of position detection devices, and more particularly, involves a position detection device for detecting a solder cylinder.

Wave soldering includes a solder cylinder. The solder cylinder can move in the up and down directions to adjust the distance between the solder cylinder and the PCB board so that the wave crest of the liquid metal solder contacts the PCB board. However, the movement distance detection of the solder cylinder in the prior art is inaccurate.

The exemplary embodiments of the present case can solve at least some of the above problems. The present case provides a position detection device, which includes a base plate, a support member, a trigger member, a trigger member and a distance sensor member. The support member is movably arranged on the base plate. The trigger member is connected to the support member. The sensing member is arranged on the trigger member. The distance sensor member is arranged on the base plate. The sensing member and the distance sensor member are arranged so that when the support member drives the sensing member to move, the distance sensor member can detect the moving distance of the sensing member, and wherein the trigger member is arranged to bypass the distance sensor member.

According to the above position detection device, the abutment member, the trigger member and the sensing member can move in the up and down directions relative to the base plate, and the trigger member is configured to bypass the distance sensing member from above the distance sensing member.

According to the above-mentioned position detection device, the distance sensor is fixedly connected to the base plate, thereby preventing the distance sensor from moving relative to the base plate.

According to the above position detection device, the trigger element includes a first rod, a second rod and a third rod connected in sequence, and the first rod, the second rod and the third rod enclose a cavity with a downward opening for arranging the distance sensor.

According to the above position detection device, the distance sensor has a sensing plane facing the sensing element, the sensing element has a sensing plane facing the distance sensor, and the sensing plane is arranged parallel to the sensing plane.

According to the above-mentioned position detection device, the distance sensor is fixedly connected to the base plate through a fixing plate, and is configured so that the sensing plane faces the sensing plane.

According to the above position detection device, the sensing plane and the sensor plane are formed extending along the up-down direction.

According to the above-mentioned position detection device, the base plate and the abutment member are provided with guide grooves and guide rails that cooperate with each other and extend in the up-down direction.

According to the above position detection device, the trigger has a first position and a second position and can move between the first position and the second position. The position detection device further comprises a reset member, which is configured to move the trigger from the second position to the first position so that the abutment member (104) connected to the trigger abuts against the solder cylinder.

According to the above-mentioned position detection device, the reset member is a spring, the lower end of the spring is connected to the base plate, and the upper end of the spring is connected to the trigger member.

The position detection device of the present invention has a higher detection accuracy of the relative movement of the sensing element and the distance sensing element.

The various specific embodiments of the present invention will be described below with reference to the accompanying drawings which form a part of this specification. It should be understood that in the following accompanying drawings, the same parts use the same figure numbers.

Various specific embodiments of the present invention will be described below with reference to the accompanying drawings that form part of this specification. It should be understood that although directional terms such as "front", "back", "up", "down", "left", "right", etc. are used in the present invention to describe various exemplary structural parts and components, these terms are used here only for the purpose of convenience of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be set in different directions, these directional terms are only used as illustrations and should not be regarded as limitations.

The ordinal words such as "first" and "second" used in this case are only used for distinction and identification, and do not have any other meanings. If not specifically specified, they do not indicate a specific order or have a specific relationship. For example, the term "first position" itself does not imply the existence of "second position", and the term "second position" itself does not imply the existence of "first position".

FIG. 1A is a three-dimensional diagram of the position detection device according to the present invention, FIG. 1B is an exploded diagram of the position detection device shown in FIG. 1A, and FIG. 1C is a front view of the position detection device shown in FIG. 1A. As shown in FIG. 1A-1C, the position detection device includes a base plate 102, a support member 104, a trigger member 106, a sensing member 112, a distance sensor 114, a limit sensor 116, and a control device 118. The support member 104, the trigger member 106, the sensing member 112, the distance sensor 114, and the limit sensor 116 are arranged on the base plate 102. The support member 104, the trigger member 106, and the sensing member 112 are connected and can move in the up and down directions relative to the base plate 102. The abutment member 104, the trigger member 106 and the sensing member 112 have a first position and a second position and can move between the first position and the second position. The second position is higher than the first position. The first position and the second position will be described in detail below.

As shown in FIGS. 1A-1C , the bottom plate 102 is provided with a first guide bar 202 and a second guide bar 204, which are arranged at a distance in the left-right direction and are used to accommodate the abutment member 104. The first guide bar 202 and the second guide bar 204 are provided with a recess extending in the up-down direction on the opposite sides. The abutment member 104 is formed to extend roughly in the up-down direction. The left and right sides of the abutment member 104 are provided with a convex portion extending in the up-down direction, which can be accommodated in the concave portion. The concave portion and the convex portion can form a guide groove and a guide rail, thereby realizing the movement of the abutment member 104 in the up-down direction relative to the bottom plate 102. The lower end of the abutment member 104 is a free end, which can abut against a solder cylinder (not shown). When the solder cylinder moves upward, the solder cylinder will abut against the abutment member 104, so that the abutment member 104 moves upward together with the solder cylinder.

It is understandable that, although the present case shows that the base plate 102 is provided with a guide groove and the abutment member 104 is provided with a guide rail, in other embodiments, the base plate 102 and the abutment member 104 may be provided with guide grooves and guide rails that cooperate with each other and extend in the up-and-down directions.

1A-1C, the sensing member 112 is fixed on the abutting member 104. The sensing member 112 is substantially a cube, and has a sensing plane 302 located on the right side. When the abutting member 104 moves between the first position and the second position, the sensing plane 302 also moves between the first position and the second position.

As shown in FIGS. 1A-1C , the trigger member 106 is fixed on the sensing member 112, thereby being fixedly connected to the abutting member 104. The trigger member 106 includes a first rod 402, a second rod 404, a third rod 406, and a fourth rod 408. The first rod 402 and the third rod 406 are extended in the up-down direction and are arranged at a distance in the left-right direction. The second rod 404 is extended in the left-right direction. The second rod 404 is connected to the upper ends of the first rod 402 and the third rod 406, and is enclosed with the first rod 402 and the third rod 406 to form a cavity 412 with a downward opening, which is used to set the distance sensor 114. The fourth rod 408 is connected to the lower end of the third rod 406 and extends toward the right side. The free end of the fourth rod 408 is used to contact the limit sensor 116.

As shown in FIGS. 1A-1C , a fixing plate 206 is provided on the bottom plate 102. The fixing plate 206 is fixedly connected to the bottom plate 102 and extends forward from the front side of the bottom plate 102 for a distance. The distance sensor 114 is connected to the front side of the fixing plate 206, thereby connecting to the bottom plate 102. The distance sensor 114 is firmly connected to the bottom plate 102 through the fixing plate 206, thereby preventing the distance sensor 114 from moving relative to the bottom plate 102. The distance sensor 114 is configured to detect the distance of the movement of the sensing element 112. Specifically, the distance sensor 114 is connected to the control device 118 for communication. The control device 118 can receive a distance signal from the distance sensor 114, thereby indicating the distance of movement of the sensing member 112, thereby indicating the distance of movement of the abutment member 104.

In this case, a sensing plane 502 is provided on one side of the distance sensor 114 facing the sensing element 112. The sensing plane 502 is provided in parallel with the sensing plane 302 of the sensing element 112, and is directly opposite to the sensing plane 302 through the setting of the fixing plate 206. The area of the sensing plane 302 is larger than the area of the sensing plane 502, so that when the sensing plane 302 moves, it can be detected by the sensing plane 502. Specifically, when the upper surface 602 of the sensing plane 302 is flush with the upper surface 702 of the sensing plane 502, the abutment member 104, the trigger member 106 and the sensing member 112 are located at a first position (as shown in FIG. 1C ); when the lower surface 604 of the sensing plane 302 is flush with the lower surface 704 of the sensing plane 502, the abutment member 104, the trigger member 106 and the sensing member 112 are located at a second position. When the sensing plane 302 moves relative to the sensing plane 502, the sensing plane 502 can detect the distance of the movement of the sensing plane 302 and send the data to the control device 118. As an example, the distance sensing member 114 and the sensing member 112 are inductive distance measuring sensors. As another example, the distance sensor element 114 and the sensing element 112 are incremental bearingless linear encoder MIL10 produced by Baumer.

As shown in Figures 1A-1C, the position detection device also includes a reset member 119. The reset member 119 is configured to move the abutment member 104, the trigger member 106 and the sensing member 112 from the second position to the first position. In this case, the reset member 119 is a spring. The lower end of the spring is connected to the base plate 102, the upper end of the spring is connected to the trigger member 106, and when the trigger member 106 is in the first position, the spring is in a stretched state. Therefore, no matter whether the abutment member 104, the trigger member 106 and the sensing member 112 are in the first position or the second position, the spring applies a downward force to the trigger member 106, thereby keeping the lower end of the abutment member 104 against the tin cylinder.

As shown in FIGS. 1A-1C , the limit sensor 116 is disposed at the upper right of the bottom plate 102 and is used to contact the fourth rod 408 of the trigger 106. When the trigger 106 contacts the limit sensor 116, the trigger 106 is located at the limit position. The limit sensor 116 is connected to the control device 118 for communication and can send a limit signal to the control device 118. When the trigger 106 moves upward and reaches the limit position, the trigger 106 contacts the limit sensor 116, so that the limit sensor 116 sends a limit signal to the control device 118, indicating that the solder cylinder has reached the limit position. In this case, the limit sensor 116 is fixed to the bottom plate 102 by means of screws 503. Specifically, a through hole 602 is provided on the limit sensor 116. A hole 208 is provided on the bottom plate 102 corresponding to the through hole 602. A thread is provided on the inner wall of the hole 208, which can be matched with the screw 503. The screw 503 can pass through the gasket 504 and then through the through hole 602, and then match with the thread of the hole 208, thereby fixing the limit sensor 116 to the bottom plate 102.

In the prior art, the welding quality between the PCB board and the components to be welded is poor. The inventors found that this is because the movement distance detection of the solder cylinder is not accurate enough, so the distance between the solder cylinder and the PCB board cannot be well controlled, which leads to the inability to well control the distance between the wave crest of the liquid metal solder in the solder paste and the PCB board. For example, in some machines, the actual distance between the top of the solder cylinder and the PCB board is 5mm, but the detection value measured by the distance sensor 114 is 6mm; the actual distance between the top of the solder cylinder and the PCB board is 8mm, but the detection value measured by the distance sensor 114 is 9mm. In some other machines, the actual distance between the top of the solder cylinder and the PCB is 5 mm, but the detection value measured by the distance sensor 114 is 4 mm; the actual distance between the top of the solder cylinder and the PCB is 8 mm, but the detection value measured by the distance sensor 114 is 7 mm. Such a detection value that deviates from the actual distance will cause the distance between the wave crest of the liquid metal solder and the PCB to be too large or too small, thereby affecting the welding quality. The inventors further discovered that the deviation between the actual distance and the detection value is caused by the setting of the sensing element 112 and the distance sensor 114. Specifically, in the prior art, in order to avoid interference between the distance sensor 114 and the trigger 106 that moves with the sensing element 112, the distance sensor 114 is connected to the base plate 102 through a bridge-shaped connector. Since the thickness of the entire position detection device in the front-to-back direction is limited to within 3 cm, the bridge-shaped connector is formed by a thin plate. Although it is fixedly connected to the base plate 102, the distance sensor 114 has a certain weight and the solder cylinder will have a temperature rise when working, so the connector will shake while thermally expanding. This makes it impossible for the sensing plane 502 to always remain parallel to the sensing plane 302, resulting in a deviation between the actual distance and the detection value. In the present invention, the inventor arranges the trigger 106 to bypass the distance sensor 114. More specifically, the trigger 106 is arranged to bypass the distance sensor 114 from above, so that the movement of the trigger 106 will not interfere with the distance sensor 114. The distance sensor 114 is firmly connected to the base plate 102, thereby ensuring that the sensing plane 502 and the sensing plane 302 remain parallel, thereby improving the detection accuracy of the relative movement of the sensing element and the distance sensor.

Although the present invention has been described in conjunction with the examples of the embodiments summarized above, various alternatives, modifications, variations, improvements and/or substantially equivalent solutions, whether known or currently or foreseeable in the near future, may be apparent to those having at least ordinary skills in the art. In addition, the technical effects and/or technical problems described in this specification are exemplary rather than restrictive; so the disclosure in this specification may be used to solve other technical problems and have other technical effects and/or may solve other technical problems. Therefore, the examples of the embodiments of the present invention as described above are intended to be illustrative rather than restrictive. Various changes may be made without departing from the spirit or scope of the present invention. Therefore, the present invention is intended to include all known or earlier developed alternatives, modifications, variations, improvements and/or substantially equivalent solutions.

102: bottom plate 104: abutment member 106: trigger member 112: sensing member 114: distance sensor member 116: limit sensor member 118: control device 119: reset member 202: first guide bar 204: second guide bar 206: fixing plate 208: hole 302: sensing plane 402: first rod 404: second rod 406: third rod 408: fourth rod 412: cavity 502: sensing plane 602: upper surface 604: lower surface 702: upper surface 704: lower surface

The features and advantages of the present invention may be better understood by reading the following detailed description with reference to the accompanying drawings, in which like reference numerals represent like parts, wherein:

FIG. 1A is a three-dimensional diagram of a position detection device according to the present invention;

FIG. 1B is an exploded view of the position detection device shown in FIG. 1A ;

FIG. 1C is a front view of the position detection device shown in FIG. 1A .

Domestic storage information (please note in the order of storage institution, date, and number) None Foreign storage information (please note in the order of storage country, institution, date, and number) None

102: Base plate

104: Abutment

106: Trigger

112:Sensor

114: Distance sensor

116: Limit sensor

Claims (10)

A position detection device, comprising: a base plate (102); a support member (104), the support member (104) being movably disposed on the base plate (102); a trigger member (106), the trigger member (106) being connected to the support member (104); a sensing member (112), the sensing member (112) being disposed on the trigger member (106); and a distance sensor member (114), the distance sensor member (114) being disposed on the base plate (102); The sensing member (112) and the distance sensor (114) are arranged such that when the abutting member (104) drives the sensing member (112) to move, the distance sensor (114) can detect the moving distance of the sensing member (112), and the trigger member (106) is arranged to bypass the distance sensor (114). According to claim 1, the position detection device, wherein: The abutment member (104), the trigger member (106) and the sensing member (112) are capable of moving in the up and down directions relative to the base plate (102), and the trigger member (106) is configured to bypass the distance sensing member (114) from above. According to the position detection device of claim 1, wherein: The distance sensor (114) is fixedly connected to the base plate (102) to prevent the distance sensor (114) from moving relative to the base plate (102). According to claim 2, the position detection device, wherein: The trigger element (106) includes a first rod (402), a second rod (404) and a third rod (406) connected in sequence, and the first rod (402), the second rod (404) and the third rod (406) enclose a cavity (412) with a downward opening for arranging the distance sensor (114). According to claim 3, the position detection device, wherein: The distance sensor (114) has a sensing plane (502) facing the sensing element (112), the sensing element (112) has a sensing plane (302) facing the distance sensor (114), and the sensing plane (502) is arranged parallel to the sensing plane (302). According to claim 5, the position detection device, wherein: The distance sensor (114) is fixedly connected to the base plate (102) via a fixing plate (206), and is configured so that the sensing plane (502) faces the sensing plane (302). According to the position detection device of claim 5, wherein: The sensing plane (502) and the sensing plane (302) are formed by extending in the up-down direction. According to the position detection device of claim 1, wherein: The bottom plate (102) and the abutment member (104) are provided with guide grooves and guide rails that cooperate with each other and extend in the up-down direction. According to claim 1, a position detection device, wherein: the trigger member (106) has a first position and a second position, and is capable of moving between the first position and the second position; the position detection device further comprises a reset member (119), the reset member (119) being configured to move the trigger member (106) from the second position to the first position, so that the abutment member (104) connected to the trigger member (106) abuts against the solder cylinder. According to the position detection device of claim 9, wherein: The reset member (119) is a spring, the lower end of the spring is connected to the base plate (102), and the upper end of the spring is connected to the trigger member (106).

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